| Place Name | Sebastian |
| Place Type | Census Designated Place |
| ZIP Code(s) | 78569 |
| County | Willacy County |
| Area Code(s) | 956 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 1,955 |
| Population Growth Rate (2010-19) | -12.15% |
| Majority Ethnicity | Hispanic 4.28% |
| Metro/Micro Stats Area | Raymondville, TX |
| US Congressional District(s) | Texas 34th |
| State House Districts | 31 |
| State Senate Districts | 27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 42.77% |
| African American | 0% |
| Hispanic | 4.28% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 52.95% |